Precipitation
Precipitation across the basin was below average this past month. December precipitation was 83 percent of average (128 percent of last year) for the 5 reporting stations. The Little Snake River basin
water-year-to-date precipitation is currently 62 percent of average (54 percent of last year). Year-to-date percentages range from 51 to 74 percent of average.
Streamflow
Runoff yield in the Little Snake River drainage is expected to be below normal this year. Stream yield is based on the 50 percent probability for the April through July forecast period. The Little Snake
River near Slater should yield about 95,000 acre-feet (61 percent of normal). Little Snake River near Dixon is estimated to yield 200,000 acre-feet (61 percent of normal).
================================================================================================================================== LITTLE SNAKE RIVER BASIN Streamflow Forecasts - January 1, 2000 ================================================================================================================================== | <<====== Drier ====== Future Conditions ======= Wetter =====>> | | | Forecast Point Forecast | ==================== Chance Of Exceeding * ====================== | Period | 90% 70% | 50% (Most Probable) | 30% 10% | 30-Yr Avg. | (1000AF) (1000AF) | (1000AF) (% AVG.) | (1000AF) (1000AF) | (1000AF) ====================================================================|=======================|===================================== Little Snake River nr Slater APR-JUL 43 71 | 95 61 | 122 168 155 | | LITTLE SNAKE R nr Dixon APR-JUL 83 153 | 200 61 | 247 317 329 | | ================================================================================================================================== LITTLE SNAKE RIVER BASIN | LITTLE SNAKE RIVER BASIN Reservoir Storage (1000 AF) - End of December | Watershed Snowpack Analysis - January 1, 2000 ================================================================================================================================== Usable | *** Usable Storage *** | Number This Year as % of Reservoir Capacity| This Last | Watershed of ================= | Year Year Avg | Data Sites Last Yr Average ========================================================================|========================================================= | LITTLE SNAKE RIVER 6 97 63 | ================================================================================================================================== * 90%, 70%, 30%, and 10% chances of exceeding are the probabilities that the actual volume will exceed the volumes in the table. The average is computed for the 1961-1990 base period. (1) - The values listed under the 10% and 90% Chance of Exceeding are actually 5% and 95% exceedance levels. (2) - The value is natural volume - actual volume may be affected by upstream water management. (3) - Forecasts produced in cooperation with Alberta Forecasting Staff Canada